Abstract Graphene fiber-based supercapacitors have attracted tremendous interest and possess the greatest potential for flexible/wearable energy storage devices. However, their specific capacitance and energy density are not sufficient and impede their widespread practical application. Here, polyaniline/graphene hybrid fibers (PANI/GF) were fabricated by a simple in situ chemical polymerization of polyaniline on graphene fibers synthesized by the wet-spinning method and a chemical reduction process. The crumpled morphology of the graphene fibers and polymerization process in a dilute solution of aniline monomer improve the structural uniformity and stability of the composite fibers. The hybrid fibers based flexible supercapacitor with solid-state electrolyte not only deliver high specific capacitance of 87.8 m F cm−2 and high energy density of 12.2 μW h cm−2 at a current density of 0.22 mA cm−2, but also exhibits long cycling stability after 10,000 cycles. This is mainly ascribed to the uniform dispersion of polyaniline on the graphene fibers and the stable structure of the hybrid fibers. The as-synthesized graphene hybrid fibers are a promising candidate for flexible/wearable supercapacitors.

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聚苯胺/石墨烯混合纤维作为柔性超级电容器的电极

摘要 基于石墨烯纤维的超级电容器引起了极大的兴趣，并且在柔性/可穿戴储能设备方面具有最大的潜力。然而，它们的比电容和能量密度不够，阻碍了它们的广泛实际应用。在这里，聚苯胺/石墨烯混合纤维（PANI/GF）是通过聚苯胺在湿纺法和化学还原工艺合成的石墨烯纤维上进行简单的原位化学聚合制备的。石墨烯纤维的皱缩形态和苯胺单体稀溶液中的聚合过程提高了复合纤维的结构均匀性和稳定性。具有固态电解质的基于混合纤维的柔性超级电容器不仅具有 87.8 m F cm-2 的高比电容和 12 的高能量密度。2 μW h cm-2 在 0.22 mA cm-2 的电流密度下，但在 10,000 次循环后也表现出长循环稳定性。这主要归功于聚苯胺在石墨烯纤维上的均匀分散和混合纤维的稳定结构。合成的石墨烯混合纤维是柔性/可穿戴超级电容器的有希望的候选者。